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| author | Sascha Hauer <s.hauer@pengutronix.de> | 2014-09-26 09:16:50 +0200 |
|---|---|---|
| committer | Sascha Hauer <s.hauer@pengutronix.de> | 2014-09-26 21:36:58 +0200 |
| commit | f59f20b9532ba0cbf0ddb5557322e899a2bec264 (patch) | |
| tree | 4348a9230d54c34fdf0b4f7aab355c5bab3c4bd0 /Documentation | |
| parent | bd27156aed5443fa5b41e04250ec86ddc33c9e20 (diff) | |
| download | barebox-f59f20b9532ba0cbf0ddb5557322e899a2bec264.tar.gz barebox-f59f20b9532ba0cbf0ddb5557322e899a2bec264.tar.xz | |
Documentation: USB: Add description for OTG device
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/user/usb.rst | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/Documentation/user/usb.rst b/Documentation/user/usb.rst index 7cdd6ac814..88be620536 100644 --- a/Documentation/user/usb.rst +++ b/Documentation/user/usb.rst @@ -143,3 +143,24 @@ USB CDC ACM compliant serial device. Unlike the :ref:`command_dfu` command the ``usbgadget`` command returns immediately after creating the gadget. The gadget can be removed with ``usbgadget -d``. + +USB OTG support +--------------- + +barebox does not have USB OTG support. However, barebox supports some USB cores in +both host and device mode. If these are specified for otg in the device tree +(dr_mode = "otg";) barebox registers a OTG device which can be used to decide which +mode shall be used. The device has a ``mode`` parameter which by default has the +value ``otg``. setting this to ``host`` or ``device`` puts the device in the corresponding +mode. Once a specific mode has been selected it can't be changed later anymore. + +.. code-block:: sh + barebox:/ devinfo otg0 + Parameters: + mode: otg ("otg", "host", "peripheral") + barebox:/ otg0.mode=host + musb-hdrc: ConfigData=0xde (UTMI-8, dyn FIFOs, bulk combine, bulk split, HB-ISO Rx, HB-ISO Tx, SoftConn) + musb-hdrc: MHDRC RTL version 2.0 + musb-hdrc: setup fifo_mode 4 + musb-hdrc: 28/31 max ep, 16384/16384 memory + barebox:/ |